Mercedes ML W166 Adblue Pre-Heater Additive Fuel Tank Heating Unit A1664710775

Mercedes ML W166 AdBlue / Fuel Tank Heater is a specialized component of the fuel system in diesel-powered vehicles, responsible for maintaining the correct medium temperature in the tank. Thanks to precise OEM design and fitment for the W166 platform, this part from the Fuel Pumps and Level Sensors group supports stable operation of the fuel system and exhaust emission reduction system in Mercedes diesel vehicles.

Specifications and technical data

• SKU: A1664710775
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1664710775
• Substitutable numbers: A1664710775, A 166 471 07 75
• Fuel type: Diesel
• Category: Fuel Pumps & Sending Units

Application and Function in the Fuel System

The presented AdBlue / fuel tank heating unit has been designed for Mercedes ML W166 generation models with a Diesel engine. Its purpose is to controlled heating of the medium in the tank, which reduces the risk of crystallization and freezing, thereby ensuring proper system supply and stable exhaust purification system operation.

This component works with other fuel system components, such as pumps, lines, and level sensors, creating a cohesive, efficient system. A properly functioning heater contributes to:

• more reliable engine start-up and operation in low temperatures,
• maintaining correct operating parameters of the emission reduction system,
• reducing the risk of diagnostic errors related to the fuel system and AdBlue.

Compatibility and Fitment for Mercedes ML W166

The discussed sub-assembly has been developed with the tank structure of the Mercedes ML W166 in mind, meaning factory fitment for mounting points, connectors, and tank geometry. This ensures a systematic installation process, without the need for modifications to the system or the use of non-factory adapters.

As a part of the Fuel Pumps and Level Sensors group, the heater works with the vehicle's factory electrical system and control, which facilitates diagnostics and integration with onboard systems. Proper selection by OEM number or vehicle VIN allows for compliance with the original vehicle configuration.

Operational Characteristics and Part Condition

The offered heating unit is a used part from a dismantled vehicle, which in practice means a real opportunity to optimize repair costs while maintaining the original manufacturer's specifications. This type of solution is particularly beneficial for advanced fuel system components, where maintaining the factory design is important for correct interaction with the vehicle's electronics.

The heater is designed to operate in demanding conditions typical for diesel vehicles, including frequent ambient temperature changes. A properly functioning component reduces the risk of fuel system disruptions, leading to more stable engine operation and less strain on other components.

Benefits of Using an Original AdBlue / Fuel Tank Heater

Using an original tank heater for the Mercedes ML W166 ensures the integrity of the entire fuel system and emission reduction system. Key benefits include:

• Factory fitment to the tank structure and vehicle's system,
• correct interaction with control electronics and onboard diagnostics,
• maintaining stable system operating parameters in low temperatures,
• reducing the risk of failures related to medium freezing in the tank.

For vehicles used intensively, in mixed cycles, or with frequent starts in low temperatures, a functional heater is an important element influencing user comfort and the predictability of the fuel system's operation.

Fuel System Service Extension and Auxiliary Materials

When replacing the heater, it is advisable to consider comprehensive diagnostics of the entire fuel system, including the condition of the pump, lines, and level sensors. Detailed information on the operating principle, diagnostics, and repair of fuel system components can be found in the article Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair, which discusses part selection by OEM or VIN number and typical fault symptoms.

If you are planning a comprehensive repair or upgrade of the fuel system area in your Mercedes and need other parts from the same group, such as pump modules, assemblies with level sensors, or complete tank inserts, check the available parts in the Mercedes Fuel Pumps and Level Sensors category.